新字
发表于 2025-3-25 04:04:04
Roman Dementiev,Johannes Singlerbsequently extracted from butter and egg yolk by McCollum and Davis (1913–1914). This was designated Vitamine A (the ‘e’ was later omitted). Its chemical structure was defined by Karrer in 1931, and it was synthesized by Isler (1946–1947). Although vitamin A can be extracted from natural sources, th
Pituitary-Gland
发表于 2025-3-25 10:15:59
https://doi.org/10.1007/978-3-319-49487-6y ultraviolet light was discussed for the first time. The isolation of the active sterols from natural sources and from irradiated provitamins was undertaken during the 1930s. In 1969 it was discovered that the vitamin is metabolized to a calcium controlling hormone.
forthy
发表于 2025-3-25 13:15:29
Tanja Hartmann,Andrea Kappes,Dorothea Wagnerkept on special milk diets. Evans and Bishop (1922) showed that these abnormalities could be prevented by a factor in lettuce and wheat germ oil. This factor was isolated in 1936 by Evans and his group and total synthesis achieved in 1938 (Karrer .). Vitamin E was recognized as essential for human n
Assault
发表于 2025-3-25 16:57:16
Clustering Data without Prior Knowledgethe investigations of Takaki (1884) on the effects of diet. In 1890 Eijkman produced experimental avian polyneuritis, a condition resembling beriberi, and showed that the curative factor was a water soluble substance present in rice-polishings. In 1901 Grijns first suggested that beri-beri and avian
使苦恼
发表于 2025-3-25 20:13:41
Jyrki Katajainen,Bjarke Buur Mortensent. This was designated vitamin B.. In 1932 Warburg and Christian described a new oxidative enzyme in yeast and one year later the two were established as identical. The constitution and the chemical synthesis were both elucidated in 1935.
斗志
发表于 2025-3-26 00:37:22
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翻动
发表于 2025-3-26 04:28:28
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血统
发表于 2025-3-26 11:15:58
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衍生
发表于 2025-3-26 15:59:51
Marcus Poggi de Aragão,Renato F. Werneckgs of Pliny. An early account of scurvy is that by Le Sieur de Joinville in the account of the crusade of St. Louis in Egypt in 1620. A knowledge of the curative value of vegetables must date back a very long time, for the American Indians have known for at least four centuries that scurvy could be
薄膜
发表于 2025-3-26 17:48:48
Debugging Network-Centric Systems,There is a general feeling that the diet of people living in most industrialized countries is completely adequate for the supply of all nutrient substances including vitamins. On the other hand some experts believe that a significant proportion of the normal population of industrialized countries may have reduced vitamin reserves.